Armrest assembly and seat

Abstract

The utility model discloses an armrest assembly and a seat. The armrest assembly comprises a back frame, a first arm section, a second arm section, a third arm section and a driving piece. The first arm section is connected to the back frame, the second arm section can rotate around a first axis relative to the first arm section, the third arm section can rotate around a second axis relative to the second arm section, and the first axis is perpendicular to the second axis. The driving part comprises a first motor and a second motor, the first motor is used for driving the second arm section to rotate, and the second motor is used for driving the third arm section to rotate. By arranging the driving assembly, the first motor can drive the second arm section to rotate relative to the first arm section, the second motor can drive the third arm section to rotate relative to the second arm section, the joint can be driven to rotate through the motors, the angle of each arm section of the handrail can be adjusted without manually rotating or pushing and pulling the handrail, and more convenience is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to seat component manufacturing technical field, concretely relates to a handrail subassembly and seat. BACKGROUND

[0002] Many seats will set up handrails on both sides of the seat to improve the use experience of users, and in different use scenes, or different body size users when using the seat, the most comfortable handrail angle for them is also different, therefore, the prior art sets up a plurality of arm sections on the handrail to make the handrail can rotate and adjust the position between each adjacent arm section to obtain the comfortable angle. SUMMARY

[0003] The utility model discloses at least solve one of the prior art technical problems. Therefore, the utility model provides a handrail subassembly, which can more conveniently adjust the handrail angle.

[0004] The utility model also provides a seat with the handrail subassembly.

[0005] The handrail subassembly according to the first aspect embodiment of the utility model, including back frame, first arm section, second arm section, third arm section and drive piece, the first arm section is connected to the back frame, the second arm section is rotatably connected to the first arm section, the second arm section can rotate relative to the first arm section around the first axis, the third arm section is rotatably connected to the second arm section, the third arm section can rotate relative to the second arm section around the second axis, the first axis and the second axis are perpendicular to each other, the drive piece includes first motor and second motor, the first motor is used to drive the second arm section to rotate, and the second motor is used to drive the third arm section to rotate.

[0006] The handrail subassembly according to the utility model embodiment has at least the following beneficial effects: the multi-joint part in the handrail subassembly in the prior art is all adopted simple mechanical structure, needs to manually adjust and fix the angle, and it is more troublesome. The handrail subassembly of the utility model embodiment is provided with the first arm section, the second arm section and the third arm section that can rotate relative to each other, by setting the drive assembly, the first motor can drive the second arm section to rotate relative to the first arm section, the second motor can drive the third arm section to rotate relative to the second arm section, the joint can be driven to rotate by the motor, without manually rotating or pushing and pulling the handrail to adjust the angle of each arm section of the handrail, and it is more convenient.

[0007] According to some embodiments of the present application, the second arm section comprises a first connecting seat and a first sub-arm section connected rotatably, the first sub-arm section is rotatable relative to the first connecting seat about a third axis, the third arm section is connected to one end of the first sub-arm section away from the first connecting seat, the first connecting seat is connected to the first arm section, the second axis is parallel to the third axis, the driving member further comprises a third motor, the third motor is used to drive the first sub-arm section to rotate, the first axis extends along a horizontal direction, the second axis and the third axis both extend along a vertical direction, and the second axis and the third axis are distributed along a horizontal direction.

[0008] According to some embodiments of the present application, the handrail assembly further comprises a lifting mechanism, the first arm section and the back frame are connected through the lifting mechanism, and the lifting mechanism is used to drive the first arm section to lift.

[0009] According to some embodiments of the present application, the third arm section comprises a second connecting seat, a second sub-arm section and a translation mechanism. The second connecting seat is connected to the second arm section. The second sub-arm section is connected to one end of the second connecting seat away from the second arm section. The translation mechanism connects the second connecting seat and the second sub-arm section, and is used to drive the second sub-arm section to move relative to the second connecting seat, so that the second sub-arm section approaches or moves away from the back frame.

[0010] According to some embodiments of the present application, the translation mechanism comprises a lead screw and a fourth motor. The lead screw is rotatably installed on the second connecting seat, the lead screw is rotatable about its own axis, and the second sub-arm section is threadedly connected to the lead screw. The fourth motor is connected to the lead screw, and the fourth motor is used to drive the lead screw to rotate, so that the second sub-arm section moves relative to the second connecting seat along the length direction of the lead screw.

[0011] According to some embodiments of the present application, from the first arm section to the second arm section, the driving member comprises a first eccentric shaft, a first sliding block, a first outer gear and a first inner gear ring arranged in sequence along the first axis. One end of the first eccentric shaft away from the first sliding block is connected to the first motor, and the number of teeth of the first outer gear is less than the number of teeth of the first inner gear ring. The two ends of the first sliding block along the first axis direction are respectively slidably connected to the first arm section and the first outer gear, so as to limit the rotation of the first outer gear along its own axis, the second arm section is fixedly connected to the first inner gear ring, and the first motor is used to drive the first eccentric shaft to rotate, so that the first outer gear rotates in the first inner gear ring, thereby making the second arm section rotate relative to the first arm section.

[0012] According to some embodiments of the utility model, the first slider includes a first protrusion towards the first arm segment, the first arm segment is provided with a first groove, the first slider is provided with a second groove on one side of the first external gear, the extension directions of the first groove and the second groove are perpendicular to each other, the first protrusion is slidably arranged in the first groove, and the first external gear includes a second protrusion, which is slidably arranged in the second groove.

[0013] According to some embodiments of the utility model, from the second arm segment to the third arm segment, the driving member includes a second eccentric shaft, a second slider, a second external gear and a second internal gear ring arranged along the second axis in sequence. One end of the second eccentric shaft away from the second slider is connected to the second motor, and the number of teeth of the second external gear is less than that of the second internal gear ring. The two ends of the second slider in the direction of the second axis are respectively slidably connected to the second arm segment and the second external gear, so as to limit the rotation of the second external gear along its own axis. The third arm segment is fixedly connected to the second internal gear ring, and the second motor is used for driving the second eccentric shaft to rotate, so that the second external gear rotates in the second internal gear ring, thereby making the third arm segment rotate relative to the second arm segment.

[0014] According to some embodiments of the utility model, from the first sub-arm segment to the first connecting seat, the driving member includes a third eccentric shaft, a third slider, a third external gear and a third internal gear ring arranged along the third axis in sequence. One end of the third eccentric shaft away from the third slider is connected to the third motor, and the number of teeth of the third external gear is less than that of the third internal gear ring. The two ends of the third slider in the direction of the third axis are respectively slidably connected to the first sub-arm segment and the third external gear, so as to limit the rotation of the third external gear along its own axis. The first connecting seat is fixedly connected to the third internal gear ring, and the third motor is used for driving the third eccentric shaft to rotate, so that the third external gear rotates in the third internal gear ring, thereby making the first sub-arm segment rotate relative to the first connecting seat.

[0015] According to the seat of the second aspect embodiment of the utility model, the armrest assembly is any one of the first aspect embodiment.

[0016] The seat has at least the following beneficial effects: the multi-joint part in the armrest assembly in the prior art is a simple mechanical structure, and angle adjustment and fixing need to be manually performed, which is relatively troublesome.

[0017] Additional aspects and advantages of the present application will be described in the following description, become apparent from the following description, or be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present application will be further described below in conjunction with the drawings and embodiments, wherein:

[0019] Figure 1 It is a perspective view of the armrest assembly in an embodiment of the present application;

[0020] Figure 2 It is a first exploded view of the connection between the first arm segment and the second arm segment in an embodiment of the present application;

[0021] Figure 3 It is a second exploded view of the connection between the first arm segment and the second arm segment in an embodiment of the present application; Figure 2

[0022] It is a second exploded view of the connection between the first arm segment and the second arm segment in an embodiment of the present application; Figure 4

[0023] It is a second exploded view of the connection between the first arm segment and the second arm segment in an embodiment of the present application; Figure 5 Figure 4 It is a first exploded view of the connection between the second arm segment and the third arm segment in an embodiment of the present application;

[0024] Figure 6 It is a second exploded view of the connection between the second arm segment and the third arm segment in an embodiment of the present application;

[0025] Figure 7 It is a first exploded view of the second arm segment of the armrest assembly in an embodiment of the present application;

[0026] Figure 8 It is a second exploded view of the second arm segment of the armrest assembly in an embodiment of the present application;

[0027] Figure 9 ​​

[0028] Figure 10 The third arm segment in one embodiment of the utility model.

[0029] The drawings show that: handrail assembly 100, back frame 101, first arm segment 102, second arm segment 103, third arm segment 104, lifting mechanism 105, first axis 201, first motor 202, first eccentric shaft 203, first sliding block 204, first outer gear 205, second recess 301, first protrusion 302, first recess 303, first inner gear ring 401, second protrusion 501, second motor 601, second eccentric shaft 602, second sliding block 603, second outer gear 604, second axis 605, second inner gear ring 701, first connecting seat 801, third motor 802, first sub arm segment 803, third eccentric shaft 804, third sliding block 805, third outer gear 806, third axis 807, third inner gear ring 901, second connecting seat 1001, second sub arm segment 1002, lead screw 1003, fourth motor 1004, translation mechanism 1005. DETAILED DESCRIPTION

[0030] The embodiments of the utility model are described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the utility model, and cannot be understood as a limitation on the utility model.

[0031] In the description of the utility model, it should be understood that the orientation description, such as up, down, front, back, left, right and the like, is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model.

[0032] In the description of the utility model, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than and the like are not included in the number, above, below, within and the like are included in the number. If it is described that the first, the second is only used for distinguishing the purpose of technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0033] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection and the like should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.

[0034] In the description of the utility model, the description of the reference terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0035] Reference Figure 1 , Figure 2 and Figure 6 , according to the first aspect embodiment of the utility model handrail assembly 100, including back frame 101, first arm section 102, second arm section 103, third arm section 104 and drive piece. First arm section 102 is connected to back frame 101, second arm section 103 is rotatably connected to first arm section 102, second arm section 103 can rotate relative to first arm section 102 around first axis 201, third arm section 104 is rotatably connected to second arm section 103, third arm section 104 can rotate relative to second arm section 103 around second axis 605, first axis 201 and second axis 605 are perpendicular to each other. Drive piece includes first motor 202 and second motor 601, first motor 202 is used to drive second arm section 103 to rotate, and second motor 601 is used to drive third arm section 104 to rotate. The multi-joint part in the prior art handrail assembly 100 is all simple mechanical structure, which needs to be manually adjusted and fixed in angle, which is more troublesome. The handrail assembly 100 of the utility model embodiment sets first arm section 102, second arm section 103 and third arm section 104 which can rotate relative to each other, by setting the drive assembly, first motor 202 can drive second arm section 103 to rotate relative to first arm section 102, and second motor 601 can drive third arm section 104 to rotate relative to second arm section 103, the joint can be driven to rotate by motor, without manually rotating or pushing and pulling the handrail to adjust the angle of each arm section of the handrail, which is more convenient. And first axis 201 and second axis 605 are perpendicular to each other, the handrail assembly 100 can have at least two rotating directions, the angle adjustment degree is high, and the adaptability is strong.

[0036] Reference Figure 1 , Figure 8 and Figure 9In some embodiments of the utility model, second arm section 103 includes rotatably connected first connecting seat 801 and first sub arm section 803, first sub arm section 803 can rotate relative to first connecting seat 801 around third axis 807, third arm section 104 is connected to one end of first sub arm section 803 away from first connecting seat 801, first connecting seat 801 is connected to first arm section 102, second axis 605 is parallel with third axis 807, drive part further includes third motor 802, third motor 802 is used to drive first sub arm section 803 to rotate, first axis 201 extends along horizontal direction, second axis 605 and third axis 807 both extend along vertical direction, second axis 605 and third axis 807 are spaced apart along horizontal direction. This can further improve the degree of freedom of handrail assembly 100, improve the use experience. It should be noted that, with reference to Figure 1 In actual use, third arm section 104 is used to support user's arm, so that the function of rotating along second axis 605 and third axis 807 is provided at both ends of second arm section 103, so that third arm section 104 can be in more positions, thereby meeting the diversified demand of placing arm.

[0037] With reference to Figure 1 In some embodiments of the utility model, handrail assembly 100 further includes lifting mechanism 105, first arm section 102 and back frame 101 are connected through lifting mechanism 105, and lifting mechanism 105 is used to drive first arm section 102 to lift. Lifting mechanism 105 can further improve the position that can be adjusted by handrail, so that user's arm can be placed at a more comfortable height, improve the use experience, specifically, with reference to Figure 1 In some embodiments of the utility model, lifting mechanism 105 is composed of telescopic rod and driving motor, first arm section 102 is sleeved on back frame 101 and fixedly connected with telescopic rod, and the lifting of first arm section 102 can be realized by driving telescopic rod to extend or retract. In some embodiments of the utility model, first arm section 102 can also be lifted by setting gear transmission or screw transmission and other mechanical structures, so that third arm section 104 used for placing arm also lifts.

[0038] With reference to Figure 1 And Figure 10In some embodiments of the utility model, third arm section 104 includes second connecting seat 1001, second sub arm section 1002 and translation mechanism 1005. Second connecting seat 1001 is connected to second arm section 103. Second sub arm section 1002 is connected to the end of second connecting seat 1001 away from second arm section 103. Translation mechanism 1005 connects second connecting seat 1001 and second sub arm section 1002, and is used to drive second sub arm section 1002 to move relative to second connecting seat 1001, so that second sub arm section 1002 is close to or away from back frame 101. Translation mechanism 1005 can further improve the controllable degree of freedom of handrail assembly 100. In use, second sub arm section 1002 is mainly used to place the user's arm, so that second sub arm section 1002 can be moved to the position required by the user in the horizontal front and back position by setting a translation mechanism 1005 on second sub arm section 1002.

[0039] Reference Figure 10 In some embodiments of the utility model, translation mechanism 1005 includes screw rod 1003 and fourth motor 1004. Screw rod 1003 is rotatably installed on second connecting seat 1001, and screw rod 1003 can rotate around its axis. Second sub arm section 1002 is threadedly connected to screw rod 1003. Fourth motor 1004 is connected to screw rod 1003, and is used to drive screw rod 1003 to rotate, so that second sub arm section 1002 moves relative to second connecting seat 1001 along the length direction of screw rod 1003. Screw rod 1003 transmission is relatively stable, so that the movement process of second sub arm section 1002 is relatively smooth, which improves the use experience. In addition, screw rod 1003 has simple structure, and is convenient to maintain and replace. It should be noted that Figure 10 In some embodiments of the utility model, the power end of fourth motor 1004 is connected to screw rod 1003 through gear transmission, so that fourth motor 1004 can be installed beside screw rod 1003, saving space. In some embodiments of the utility model, translation mechanism 1005 can also use gear and rack transmission and other modes to realize the movement of second sub arm section 1002.

[0040] Reference Figures 1 to 5In some embodiments of the utility model, by first arm section 102 to second arm section 103, driving piece includes first eccentric shaft 203, first sliding block 204, first outer gear 205, first inner gear ring 401 that sets up in turn along first axis 201. First eccentric shaft 203 is connected to first motor 202 at the end away from first sliding block 204, and the number of teeth of first outer gear 205 is less than the number of teeth of first inner gear ring 401. The both ends of first sliding block 204 in the direction of first axis 201 are slidably connected first arm section 102 and first outer gear 205 respectively to limit the rotation of first outer gear 205 along its axis, and second arm section 103 is fixedly connected to first inner gear ring 401. First motor 202 is used to drive first eccentric shaft 203 to rotate to make first outer gear 205 rotate in first inner gear ring 401, thereby making second arm section 103 rotate relative to first arm section 102. When first driving piece rotates, first eccentric shaft 203 makes circular motion, thereby driving first outer gear 205 to move, and because first outer gear 205 is slidably connected with first sliding block 204, and first sliding block 204 is slidably connected with first arm section 102, first outer gear 205 cannot rotate along itself, and because the number of teeth of first outer gear 205 is less than the number of teeth of first inner gear ring 401, first outer gear 205 will not completely mesh with first inner gear ring 401, but force is transmitted to first inner gear ring 401 through the meshing part, thereby making first inner gear ring 401 rotate, thereby achieving the technical effect that second arm section 103 rotates relative to first arm section 102. Such design can make second arm section 103 relatively stationary with first arm section 102, without the need for meshing between the gear and the gear ring to maintain stability, and the stable state can be achieved by the limitation of first sliding block 204, the locking force is strong, the support strength is satisfied, and the force will not be transmitted to the motor, without affecting the motor drive of first motor 202.

[0041] Reference Figures 2 to 5 In some embodiments of the utility model, first sliding block 204 includes first lug 302 towards first arm section 102, first arm section 102 is provided with first recess 303, and the side of first sliding block 204 towards first outer gear 205 is provided with second recess 301, the extension directions of first recess 303 and second recess 301 are perpendicular to each other, first lug 302 is slidably arranged in first recess 303, and first outer gear 205 includes second lug 501, and second lug 501 is slidably arranged in second recess 301. The perpendicularity of first recess 303 and second recess 301 can make first outer gear 205 move to each position in first inner gear ring 401, thereby better driving first inner gear ring 401 to rotate, and the perpendicular design can improve the locking strength of the connection, and the static and stable state can be maintained at each position. Figure 3In some embodiments of the utility model, first sliding block 204 is designed as a cross structure as a whole, and a corresponding cross-shaped groove is arranged in first arm segment 102, so that the sliding connection stability of first sliding block 204 and first arm segment 102 can be further improved.

[0042] Reference Figure 6 And Figure 7 In some embodiments of the utility model, the driving member includes a second eccentric shaft 602, a second sliding block 603, a second external gear 604 and a second internal gear ring 701 arranged in sequence along the second axis 605 from the second arm segment 103 to the third arm segment 104. The second eccentric shaft 602 is connected to the second motor 601 at one end away from the second sliding block 603, and the number of teeth of the second external gear 604 is less than that of the second internal gear ring 701. The two ends of the second sliding block 603 in the direction of the second axis 605 are respectively connected to the second arm segment 103 and the second external gear 604 in a sliding manner, so as to limit the rotation of the second external gear 604 along its axis. The third arm segment 104 is fixedly connected to the second internal gear ring 701. The second motor 601 is used to drive the rotation of the second eccentric shaft 602, so that the second external gear 604 rotates in the second internal gear ring 701, thereby making the third arm segment 104 rotate relative to the second arm segment 103. The rotating connection mode of the second arm segment 103 and the third arm segment 104 is the same as that of the first arm segment 102 and the second arm segment 103, which will not be described here. It should be noted that in order to better place the second motor 601, the connection between the second motor 601 and the second eccentric shaft 602 is further provided with a worm and gear transmission mechanism, so that the transmission direction can be adjusted, and the transmission process is more stable. Figure 6

[0043] Reference Figure 8 And Figure 9 ​In some embodiments of the utility model, by first sub arm section 803 to first connecting seat 801, driving piece includes third eccentric shaft 804, third sliding block 805, third external gear 806, third internal gear 901 arranged in sequence along third axis 807. Third eccentric shaft 804 is connected to third motor 802 at the end away from third sliding block 805, and the number of teeth of third external gear 806 is less than the number of teeth of third internal gear 901. The two ends of third sliding block 805 in third axis 807 direction are slidably connected with first sub arm section 803 and third external gear 806 respectively to limit third external gear 806 from rotating along its axis, and first connecting seat 801 is fixedly connected to third internal gear 901. Third motor 802 is used to drive third eccentric shaft 804 to rotate to make third external gear 806 rotate in third internal gear 901, thereby making first sub arm section 803 rotate relative to first connecting seat 801. The rotating connection mode of first sub arm section 803 and first connecting seat 801 is the same as the rotating connection mode of first arm section 102 and second arm section 103, which will not be repeated here. It should be noted that, with reference to Figure 8 And Figure 9 In order to better place third motor 802, a worm gear transmission mechanism is also added between third motor 802 and third eccentric shaft 804, which can adjust the transmission direction and make the transmission process more stable.

[0044] According to the seat of the second aspect of the utility model, it comprises the armrest assembly 100 of any one of the first aspect of the utility model. The multi-joint part in the prior art armrest assembly 100 is all adopted simple mechanical structure, and needs to be manually adjusted and fixed in angle, which is relatively troublesome. The armrest assembly 100 of the utility model embodiment is provided with the first arm section 102, the second arm section 103 and the third arm section 104 that can rotate relatively, the driving assembly is arranged, the first motor 202 can drive the second arm section 103 to rotate relative to the first arm section 102, the second motor 601 can drive the third arm section 104 to rotate relative to the second arm section 103, the joint can be driven to rotate by the motor, and it is not necessary to manually rotate or push and pull the armrest to adjust the angle of each arm section of the armrest, which is more convenient, thereby improving the use experience of the seat.

[0045] The utility model embodiments are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by the ordinary skilled in the art without departing from the purpose of the utility model. In addition, the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

Claims

1. A handrail assembly, characterized in that The armrest assembly comprises: a back frame; a first arm segment connected to the back frame; a second arm segment rotatably connected to the first arm segment, the second arm segment being rotatable relative to the first arm segment about a first axis; a third arm segment rotatably connected to the second arm segment, the third arm segment being rotatable relative to the second arm segment about a second axis, the first axis being perpendicular to the second axis; a driving member comprising a first motor and a second motor, the first motor being configured to drive the second arm segment to rotate, and the second motor being configured to drive the third arm segment to rotate.

2. The handrail assembly of claim 1, wherein, The second arm segment comprises a first connecting seat and a first sub-arm segment rotatably connected to the first connecting seat, the first sub-arm segment being rotatable relative to the first connecting seat about a third axis, the third arm segment being connected to an end of the first sub-arm segment away from the first connecting seat, the first connecting seat being connected to the first arm segment, the second axis being parallel to the third axis, the driving member further comprising a third motor configured to drive the first sub-arm segment to rotate, the first axis extending in a horizontal direction, the second axis and the third axis both extending in a vertical direction, and the second axis and the third axis being spaced apart in a horizontal direction.

3. The handrail assembly of claim 1, wherein, The armrest assembly further comprises a lifting mechanism, the first arm segment being connected to the back frame via the lifting mechanism, the lifting mechanism being configured to drive the first arm segment to lift.

4. The handrail assembly of claim 1, wherein, The third arm segment comprises: a second connecting seat connected to the second arm segment; a second sub-arm segment connected to an end of the second connecting seat away from the second arm segment; and a translation mechanism connecting the second connecting seat and the second sub-arm segment, the translation mechanism being configured to drive the second sub-arm segment to move relative to the second connecting seat so as to move the second sub-arm segment to be closer to or farther away from the back frame.

5. The handrail assembly of claim 4, wherein, The translation mechanism comprises: a lead screw rotatably mounted to the second connecting seat, the second sub-arm segment being threadedly connected to the lead screw, the lead screw being rotatable about an axis thereof; and a fourth motor connected to the lead screw, the fourth motor being configured to drive the lead screw to rotate so as to drive the second sub-arm segment to move relative to the second connecting seat along a length direction of the lead screw.

6. The handrail assembly of claim 1, wherein, From the first arm segment to the second arm segment, the driving member comprises, in sequence along the first axis, a first eccentric shaft, a first sliding block, a first outer gear, and a first inner gear ring. An end of the first eccentric shaft away from the first sliding block is connected to the first motor, the first outer gear having a smaller number of teeth than the first inner gear ring. Two ends of the first sliding block in the first axis direction are respectively slidably connected to the first arm segment and the first outer gear so as to restrict the first outer gear from rotating about an axis thereof, the second arm segment being fixedly connected to the first inner gear ring, the first motor being configured to drive the first eccentric shaft to rotate so as to drive the first outer gear to rotate in the first inner gear ring, thereby driving the second arm segment to rotate relative to the first arm segment.

7. The handrail assembly of claim 6, wherein, The first slider comprises a first protrusion towards the first arm segment, the first arm segment is provided with a first groove, the first slider is provided with a second groove towards one side of the first external gear, the extending directions of the first groove and the second groove are perpendicular to each other, the first protrusion is slidably arranged in the first groove, and the first external gear comprises a second protrusion, the second protrusion is slidably arranged in the second groove.

8. The handrail assembly of claim 1, wherein, From the second arm segment to the third arm segment, the driving member comprises a second eccentric shaft, a second slider, a second external gear and a second internal gear ring arranged in sequence along the second axis; The second eccentric shaft is connected to the second motor at an end away from the second slider, and the number of teeth of the second external gear is less than the number of teeth of the second internal gear ring; The two ends of the second slider in the direction of the second axis are respectively slidably connected to the second arm segment and the second external gear, so as to limit the rotation of the second external gear along its axis, the third arm segment is fixedly connected to the second internal gear ring, and the second motor is used to drive the rotation of the second eccentric shaft, so that the second external gear rotates in the second internal gear ring, thereby making the third arm segment rotate relative to the second arm segment.

9. The handrail assembly of claim 2, wherein, From the first sub-arm segment to the first connecting seat, the driving member comprises a third eccentric shaft, a third slider, a third external gear and a third internal gear ring arranged in sequence along the third axis; The third eccentric shaft is connected to the third motor at an end away from the third slider, and the number of teeth of the third external gear is less than the number of teeth of the third internal gear ring; The two ends of the third slider in the direction of the third axis are respectively slidably connected to the first sub-arm segment and the third external gear, so as to limit the rotation of the third external gear along its axis, the first connecting seat is fixedly connected to the third internal gear ring, and the third motor is used to drive the rotation of the third eccentric shaft, so that the third external gear rotates in the third internal gear ring, thereby making the first sub-arm segment rotate relative to the first connecting seat.

10. A seat, characterized by The handrail assembly comprises the handrail assembly according to any one of claims 1-9. The handrail assembly comprises the handrail assembly according to any one of claims 1-9.

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